Array to Class Mapper

A simple library which automatically maps a given multi dimensional array to a given class.

Getting Started

Installing

Run composer require emulgeator/array-to-class-mapper to add this library as a dependency to your project

Usage

Simple scalar type mapping

use Emul\ArrayToClassMapper\MapperFactory;

class DTO
{
    private int $id;

    private float $value;

    public function __construct() {
        // Constructor wont be called
    }
}

$arrayToMap = [
    'id' => '1',
    'value' => '1.2'
];

$mapper = (new MapperFactory())->getMapper();

/** @var DTO $dto */
$dto = $mapper->map($arrayToMap, DTO::class);

As you'll see the library casts the values from the given array. So for example: $dto->id will be an integer indeed.

The mapper does that by checking the type of the property. If it's not set it tries to fetch this information from the DocBlock

Class mapping

use Emul\ArrayToClassMapper\MapperFactory;

require_once 'vendor/autoload.php';

class InnerDTO
{
    private string $key;
    private string $value;
}

class DTO
{
    private InnerDTO $inner;
}

$arrayToMap = [
    'inner' => [
        'key'   => 'first_key',
        'value' => 'value'
    ]
];

$mapper = (new MapperFactory())->getMapper();

/** @var DTO $dto */
$dto = $mapper->map($arrayToMap, DTO::class);

Complex type mapping

In case of complex types you both DocBlock and type hinting can be used. See the previous example modified to have a series of inner objects:

use Emul\ArrayToClassMapper\MapperFactory;

require_once 'vendor/autoload.php';

class InnerDTO
{
    private string $key;
    private string $value;
}

class DTO
{
    private int $id;

    /** @var InnerDTO[] */
    private array $inner = [];
}

$arrayToMap = [
    'id' => 1,
    'inner' => [
        [
            'key'   => 'first_key',
            'value' => 'value'
        ],
        [
            'key'   => 'second_key',
            'value' => 'value'
        ],
    ]
];

$mapper = (new MapperFactory())->getMapper();

/** @var DTO $dto */
$dto = $mapper->map($arrayToMap, DTO::class);

Defining custom mapper for specific type

If a data mapping is not possible by simply casting the stored value, custom mappers can be set:

use Carbon\Carbon;
use Carbon\CarbonInterface;
use Emul\ArrayToClassMapper\MapperFactory;

require_once 'vendor/autoload.php';

class InnerDTO
{
    private string $key;
    private string $value;

    public function __construct(string $keyPrefix, string $key, string $value)
    {
        $this->key   = $keyPrefix . $key;
        $this->value = $value;
    }
}

class DTO
{
    private int $id;

    /** @var InnerDTO[] */
    private array $values;
}

$arrayToMap = [
    'id'        => 1,
    'values' => [
        [
            'key' => 'first',
            'value' => '1'
        ],
    ],
];

$mapper = (new MapperFactory())->getMapper();

$innerDTOMapper = \Closure::fromCallable(function (array $data) {
    return new InnerDTO('prefix_', $data['key'], $data['value']);
});

$mapper->addCustomMapper(InnerDTO::class, $innerDTOMapper);
/** @var DTO $dto */
$dto = $mapper->map($arrayToMap, DTO::class);

The same works if the Custom type is in an array but in this case the mapper function will receive the subarray as is:

Limitations

The library currently is not able to import and auto load a class defined in a DocBlock. The following example will not work because the class is not imported neither we know the FQCN:

/** @var Value[] */
private array $values = [];

To fix this you need to use the FQCN of the class:

/** @var \NameSpace\Value[] */
private array $values = [];